WhatsApp earlier this year announced they would no longer be supporting BlackBerry OS and BlackBerry 10 handsets by the end of 2016 but it seems they have changed their mind.

According to an update in the FAQ section of the WhatsApp App it has now been extended to June 2017.

WhatsApp support for mobile devicesAs announced in our blog, we will soon be ending support for certain devices. On June 30, 2017, we will no longer support the following platforms:BlackBerry OS and BlackBerry 10 Nokia S40 Nokia Symbian S60 The following platforms will no longer be supported at the beginning of 2017:Android 2.1 and Android 2.2 Windows Phone 7 iPhone 3GS/iOS 6These platforms don't offer the kind of capabilities we need to expand our app's features in the future. If you use one of these affected mobile devices, we recommend upgrading to a newer Android running OS 2.3+, a Windows Phone 8+, or an iPhone running iOS 7+ before the end of 2016 to continue using WhatsApp.

The new update for the BlackBerry 10 version is available through BlackBerry World, it should be however noted that this just resets the time-bomb built into the app. a whole lot of people have been trying to dispose their phones to get compatible ones but i guess now they'll wait a little more.